New tests to replace view_test runtime: 15->0.125s

Created by: birdsarah

Previously, the 8 tests in view_test were taking 12 seconds to run. By removing the dependency on the DecisionTestCase, and the user of the test client, the run time has been dramatically reduced.

If we could do this on all the tests, the test suite would drop in run time to under 1s!!

NOTE - this includes three failing tests. One looks like a bug in the code, the other two would round out the tests but are much easier done with a small code change in views.py

Once we've code-reviewed this, we probably want to get the tests passing before we merge.